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LP 71-82

An R band light curve for LP 71-82 showing flares, adapted from Baran et al. (2013)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Draco
Right ascension	18 02 16.60
Declination	64° 15′ 44.6″
Apparent magnitude (V)	13.51
Characteristics
Spectral type	M5.0V
Apparent magnitude (J)	8.54
Astrometry
Proper motion (μ)	RA: 196.394 mas/yr Dec.: -383.789 mas/yr
Parallax (π)	128.3057 ± 0.0319 mas
Distance	25.420 ± 0.006 ly (7.794 ± 0.002 pc)
Details
Mass	0.16±0.01 M☉
Radius	0.195±0.002 R☉
Luminosity	0.0033±0.0003 L☉
Habitable zone inner limit	0.06
Habitable zone outer limit	0.12
Surface gravity (log g)	4.5 cgs
Temperature	3124±51 K
Rotation	0.28018±0.000010 d
Rotational velocity (v sin i)	11.3±1.5 km/s
Age	0.5 −0.34 Gyr
Other designations
Gaia DR2 2161121135533953536, G 227-22, LP 71-82, LSPM J1802+6415, NLTT 45873, GSC 04209-01465, 2MASS J18021660+6415445
Database references
SIMBAD	data

LP 71-82 is a red dwarf star, located in constellation Draco at 25.42 light-years from Earth. Kinematically, it is probably belongs to the Ursa Major Moving Group.

LP 71-82 is a flare star with a very strong activity, with at least four flares detected by 2019. Such activity is expected for a star with a short rotational period of just 6 hours. As a low mass star, it is fully convective. It is visible nearly pole-on, with rotational axis deflected from the Sun by 19±3° degrees. The star has a magnetic fields in chromosphere in 3.8-4.7 kilogauss range.

Multiplicity surveys did not find any stellar companions to LP 71-82 as in 2014.

References

1. ^ Mt. Suhora Survey – Searching for Pulsating M Dwarfs. III
2. Reiners, A.; et al. (2017), "The CARMENES search for exoplanets around M dwarfs", Astronomy & Astrophysics, 612: A49, arXiv:1711.06576, doi:10.1051/0004-6361/201732054
3. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
4. ^ Robertson, Paul; Stefansson, Gudmundur; Mahadevan, Suvrath; Endl, Michael; Cochran, William D.; Beard, Corey; Bender, Chad F.; Diddams, Scott A.; Duong, Nicholas; Ford, Eric B.; Fredrick, Connor; Halverson, Samuel; Hearty, Fred; Holcomb, Rae; Juan, Lydia; Kanodia, Shubham; Lubin, Jack; Metcalf, Andrew J.; Monson, Andrew; Ninan, Joe P.; Palafoutas, Jonathan; Ramsey, Lawrence W.; Roy, Arpita; Schwab, Christian; Terrien, Ryan C.; Wright, Jason T. (2020), "Persistent Starspot Signals on M Dwarfs: Multiwavelength Doppler Observations with the Habitable-zone Planet Finder and Keck/HIRES", The Astrophysical Journal, 897 (2): 125, arXiv:2005.09657, Bibcode:2020ApJ...897..125R, doi:10.3847/1538-4357/ab989f, S2CID 218718929
5. ^ Rodríguez Martínez, Romy; Lopez, Laura A.; Shappee, Benjamin J.; Schmidt, Sarah J.; Jayasinghe, Tharindu; Kochanek, Christopher S.; Auchettl, Katie; Holoien, Thomas W.-S. (2019), "A Catalog of M-dwarf Flares with ASAS-SN", The Astrophysical Journal, 892 (2): 144, arXiv:1912.05549, doi:10.3847/1538-4357/ab793a, S2CID 209323915
6. Reliable probabilistic determination of membership in stellar kinematic groups in the young disk, Table 4
7. Shulyak, D.; Reiners, A.; Nagel, E.; Tal-Or, L.; Caballero, J. A.; Zechmeister, M.; Béjar, V. J. S.; Cortés-Contreras, M.; Martin, E. L.; Kaminski, A.; Ribas, I.; Quirrenbach, A.; Amado, P. J.; Anglada-Escudé, G.; Bauer, F. F.; Dreizler, S.; Guenther, E. W.; Henning, T.; Jeffers, S. V.; Kürster, M.; Lafarga, M.; Montes, D.; Morales, J. C.; Pedraz, S. (2019), "Magnetic fields in M dwarfs from the CARMENES survey", Astronomy & Astrophysics, 626: A86, arXiv:1904.12762, Bibcode:2019A&A...626A..86S, doi:10.1051/0004-6361/201935315, S2CID 139101130
8. Janson, Markus; Bergfors, Carolina; Brandner, Wolfgang; Kudryavtseva, Natalia; Hormuth, Felix; Hippler, Stefan; Henning, Thomas (2014), "The Astralux Multiplicity Survey: Extension to Late M-Dwarfs", The Astrophysical Journal, 789 (2): 102, arXiv:1406.0535, Bibcode:2014ApJ...789..102J, doi:10.1088/0004-637X/789/2/102, S2CID 118403775

v t e Constellation of Draco
List of stars in Draco Draco in Chinese astronomy
Stars	Bayer α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ (Dziban) ψ ω Flamsteed 6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 64 (e) 68 Variable TW AG BY CL CM CX DO V581 HR 3751 4126 4934 5811 6237 6618 (Alruba) 6817 7137 7783 HD 101364 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 LP 71-82 Qatar-1 Struve 2398 TOI-1136 WISE 1647+5632
Exoplanets Orbitar HD 139357 b HD 167042 b Hypatia Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i TOI-1452 b TrES-2b
Star clusters LAMOST 1
Nebulae Abell 50 Cat's Eye Nebula
Galaxies	NGC 3147 4121 4125 4236 4319 4345 4513 4589 5678 5777 5866 5866B 5879 5906 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 356 3C 371 3C 390.3 3C 401 4C +72.26 H1821+643 HFLS3 KKR 25 Markarian 876 PGC 39058 S5 1803+784 S5 2007+777 UGC 9391
Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster
Astronomical events Swift J1644+57 SN 2005B SN 2016aps
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